Timing device



Oct. 14. 1924. 1,5Tl,893,

- P. s. YLUTTRELL ET AL TIMING msvxca- Filed March 21. 1921zsheezs-snaz, -1'

WITNESS: law/1.- M)/: Ma P004 c. Ros/r4 ATTORNEYS.

- Oct. 14. 1924. "1 ;5rr,s93

. I P. s. LUTTRELL ET AL mum DEVICE Filed March 21'. 1921 2 sheets-sum 2\lln'mess: INVENTORS ab; ATTORNEYS.

Patented Oct. 14, 1924.

" UNITED STATES PATENT OFFICE.

PAUL S. LUTTRELL AND PAUL C. ROSKE, OF OAKLAND, CALIFORNIA.

TIMING DEVICE.

Application filed March 21, 1921.

To aZZ whom it may concern:

Be it known that we, PAUL S. LUTTRELL and PAUL C. Rosnn, citizens of theUnited States, and residents of Oakland, county of Alameda, and State ofCalifornia, have invented a certain new and useful Timing Device. ofwhich the following is a specification.

The invention relates to timing devices and particularly to alarm clocksthat may be set to sound an alarm when a predetermined interval of timehas elapsed.

An object of the invention is to provide an alarm clock which may be setto sound the alarm at the end of a definite predetermined time.

Another object of the invention is to provide an improvedalarm tripmechanism.

A further object of the invention is to improve the construction of thedevice of the character described, to make it simple and substantial andcheap to manufacture.

The. invention possesses other advan tageous features, some of which,with the foregoing, will be set forth at length in the followingdescription, where we shall outline in full, that form of the inventionwhich we have selected for illustration in the drawings accompanying andforming part of the present specification. In said drawings we haveshown oneembodiment of our invenlimit ourselves to such form. since theinven' ,tion, as set forth in the claims, may be. em-

bodied in a plurality of forms.

Referring to said drawings:

Figure 1 is a perspective view of the de vice of our invention. 1

Figure 2 is a front elevation of the mechanism.

Figure 3 is a detail elevation of the elapsed interval alarm settingmechanism.

Figure 4 is a cross section of the alarm setting mechanism. 7

Figure 5 is a section taken on the line 5-5, Figure 3.

Figure 6 is a detail elevation of one of the elapsed time setting discs.

The device comprises a suitable casing 2 in which the clock mechanism isdisposed. The casing is provided with a clock dial 3, over which thetime indicating hands 45 are moved by the clock mechanism 6. Anydesirable clock mechanism may be employed and we donot limit ourselvesto the particular clock mechanism shown. The

which the tooth 31 of the alarm tri Serial No. 453,925.

minute hand 4; is driven by the time shaft 7, whose movement iscontrolled by the escapement mechanism 8 and the hour hand 5 is drivenfrom the time shaft by the customary gearing.

The clock is provided with a suitable alarm mechanism, driven by thespring 9,

which mechanism, when released, causes the vibration of the alarm hammer12, causing it to strike a bell, not shown, arranged with ing thecasing. Means are provided for releasing the alarm. mechanism after a.definite predetermined elapsed time interval, to cause the alarm tosound.

Secured to the time shaft 7 is a bevel gear 13, which is adapted to beengaged by the alarm releasing mechanism. Journaled in the clock frameand in the bearing plate 14 is a shaft 15, to which is splined a sleeve16, carrying on its inner end a bevel gear 17 adapted to mesh with gear13. Means are provided for moving the sleeve to move the gear 17 intoand out of mesh with gear 13. Pivoted to the clock frame is a lever 18,provided intermediate its ends with a pin 19, engaging in the annulargroove 21 on the sleeve 16, so that rocking movement of the lever causeslongitudinal movement of the sleeve. At its free end, the lever isprovided with an are shaped aperture 22 havinga flat side 23. and pins24.. secured to the Geneva gear are disposed in the aperture. The Genevagear is mounted on the clock frame and partial rotation of the gearcauses the lever to be shifted. Movement of the Geneva gear in aclockwise direction causesa movement of the end of the lever to theright and movement of the gear in a counter-clockwise direction causes amovement of the free end of the lever to the left. A movement to theleft meshes gears 13 and 17 and a movement to the right separates thegears. The Geneva gear is rotatedin a step-by-step movement by a singletoothed gear 26 secured to the end of the alarm spring shaft 27. Whenthe alarm spring is wound, the Geneva gear is rotated in acounter-clockwise direction bringing the time shaft into connection withthe alarm control shaft 15, and conversely, when the alarm springunwinds, during the sounding of the alarm, the time shaft isseparatedfrom the alarm control shaft.

secured to the alarm control shaft'is a disc 28 having a notch 29therein, into level must move as the alarm hammer vibrates.

Journaled on the shaft 15 and connected to the disc 28 or to the shaftby a suitable train of gears 31-323834 is a second disc 35 having anotch 36 therein into which the tooth 57 of the alarm trip lever mustmove as the alarm hammer vibrates. The gear train connecting the twodiscs is such that the disc 28 makes twelve revolutions for eachrevolution of the disc 35. This is due to the fact that in the presentconstruc tion a the disc 28 represents n'iinutes and the disc 35represents hours, and the alarm control shaft makes one revolution perhour, but the relative speeds of the two discs may be in a differentratio if other time units are selected. In order that the alarm hammermay be free to vibrate, .both notches and 36 must be in position topermit the entry of the teeth 31 and 3'? and if either disc is rotatedslightly, the alarm cannot sound.

Secured to the disc 35 is a dial 38, marked with numbers representinghours, which rotates with the disc Engaging the shaft 15, through themedium of a gear train 41, is an elapsed time setting shaft 42 whichextends through the center of a dial 43., arranged in the casing, thedial 43 being graduated in minutes. The dial 43 is shown disposed at theside of the casing, but it may be arranged in any other desiredposition. Secured to the shaft 42 is a setting knob 4.4 and an indicator45, movable over the dial 43, to indicate the elapsed time interval forwhich the alarm is set. The disc 28 moves synchronously with theindicator 45. The dial 43 is provided with an aperture 46 through whichthe successive numbers on the dial 38 are visible.

When it is desired to set the alarm to sound at the end of apredetermined time interval, the knob 44 is turned until. the de siredtime interval is indicated on the dials 38 and 43 and then the alarmspring is wound. This places the alarm control shaft in connection withthe time shaft, so that the two shafts rotate synchronously. At the endof the time interval, the discs 28 and 35 have moved to bring thenotches under the teeth on the alarm trip lever and the alarm issounded. The unwinding of the alarm spring moves the alarm control shaftout of engagement with the time shaft.

In Fig. 1, the alarm is set to sound at the end of a two-hour interval,but it may be set for any desired interval of hours and minutes, withinthe range of the device, which, in the present instance, is twelvehours. The device permits the accurate timing of operations requiringexact and accurate timing in minutes or hours and minutes.

We claim:

1. In a timing device, a timing mech anism, an alarm mechanism, aspringfor driving the alarm mechanism, an alarm trip controlling mechanism,and means operative by the winding of the alarm spring for connecting"the timing mechanism and the alarm trip controlling mechanism.

In a timing device, a timing mech anism, an alarm mechanism, a springfor driving the alarm mechanism, an alarm trip controlling mechanismnormally out of engement with the timing mechanism, and

means operative by the winding of the alarn'i spring for connecting thetiming mechanism and the alarm trip controlling mechanism and operativeby the unwinding of the alarm spring for disconnecting the timingmechanism and the alarm trip controlling mechanism.

3. In a timing device, a time shaft, an alarm mechanism, a spring fordriving said mechanism, an alarm trip controlling shaft normally out ofengagement with the time shaft, and means operative by the winding ofthe alarm spring for establishing con nection between the time shaft andthe alarm trip control shaft.

4. In a timing device, a time shaft, an alarm mechanism, a spring fordriving said mechanism, an alarm trip controlling shaft, a sleevesplincd tosaid control shaft and normally out of engagement with. thetime shaft, and. means operative by the winding of the alarm spring formoving the sleeve longitudinally into engagement with the time shaft.

In a timing device, a time shaft, a gear on said shaft, an alarmmechanism, a spring for driving said mechanism, an alarm tripcontrolling shaft. a sleeve splined to said control shaft, a gear onsaid. sleeve normally out of engagement with the gear on the time shaftand means operative by the winding of the alarm spring for moving thesleeve longitudinally to bring said gears into mesh.

6, in a timingdeiice. time shaft, a gear on said shaft an alarmmechanism, a spring for driving said mechanisml an alarm tripcontrolling shaft, a sleeve splined to said control shaft, a gear onsaid sleeve normally out of engagement with the gear on the time shaft.a lever engaging said sleeve and means operative by the winding of thealarm spring for moving the lever to bring the gears into mesh.

7. In a timing device, a timing mecha nism, an alarm. mechanism. analarm trip controlling shaft adapted to be rotated by the timingmechanism, axially alined notched discs arranged to be rotated by thecontrolling shaft at different speeds, and an alarm trip provided withteeth adapted to enter the notches in the discs to release said alarmmechanism.

8. In a timing device, a timing mechanism, an alarm mechanism, an alarmtrip controlling shaft adapted to be rotated by the timing mechanism, anotched disc secured to the controlling shaft, a second notched discgeared to said controlling shaft and arranged to be rotated at adifferent speed than said first notched disc, an alarm trip mechanismadapted to simultaneously enter the notches in both discs to trip thealarm mechanism, and means independent of the timing mechanism forrotating said control shaft.

9. In a timing device, a timin mechanism, an alarm mechanism, an a armtrip controlling shaft adapted to be rotated by the timing mechanism, anotched disc secured to the controlling shaft, a second notched discgeared to said controlling shaft and arranged to be rotated at adifferent speed than said first notched disc, an alarm trip mechanismadapted to simultaneously enter the notches in both discs to trip thealarm mechanism, a setting knob geared to said control shaft, anindicator secured to said setting knob and a dial over which saidindicator moves.

10. In a timing device, a timing mechanism, an alarm mechanism, analarm-trip controlling shaft adapted to be rotated by the timingmechanism, a notched disc secured to the controlling shaft, a secondnotched disc geared to said controlling shaft and arranged to be rotatedat a different speed than said first notched disc, an alarm tripmechanism adapted to simultaneously enter the notches in both discs totrip the alarm mechanism, a setting knob geared to said first disc, adial secured to the second disc, an apertured dial disposed in front ofsaid first dial and through the aperture in which the first dial isvisible, and an indicator secured to the knob and movable over saidsecond dial. a

11. In a timing device, a time shaft, a. gear on said shaft, an alarmmechanism, a spring for driving said mechanism, a shaft to which saidspring is attached, an alarm trip controlling shaft, a sleeve splined tosaid. control shaft, a gear on said sleeve normally out of engagementwith the gear on the time shaft, a lever engaging said sleeve, a Genevagear, a pin on said gear engaging in the end of said lever, and a gearon the alarm spring shaft arranged to engage said Geneva gear to movesaid lever.

12 In a timing device, a timing mecha nism, an alarm mechanism, a springfor driving the alarm mechanism, an alarm control, an alarm timeindicating hand, means for driving the alarm time indicating hand inunison with the timing mechanism, and means operative by the winding ofthe alarm spring to automatically form said driving connection beforethe alarm is given, and for automatically disconnecting said drivingconnection when the alarm has been sounded.

13. In a timing device, a timing mechanism, an alarm mechanism, a springfor driving the alarm mechanism, an alarm control, an alarm timeindicating hand, means for driving the alarm time indicating hand inunison with the timing mechanism, means operative by the winding of thealarm spring to automatically form said driving connection before thealarm is given and for automatically disconnecting said drivingconnection when the alarm has been sounded, an alarm trip controllingmechanism, and means actuated by the alarm time indicator hand forreleasing said trip controlling mechanism.

14. In a timing device of the character described, a time dial, anindicator hand therefor, a driving mechanism for said. indicator, analarm set dial, an indicating hand therefor, an alarm mechanismcooperating therewith, spring actuated means for driving said alarm,means for winding said spring, means forming an automatic couplingbetween the time indicator and the alarm time indicator to drive thesame in unison, and means actuated by the alarm winding mechanism forautomatically connecting the coupling during winding of the spring andoperative by the unwinding of the alarm spring for disconnecting saidcoupling.

In testimony whereof, we have hereunto set our hands at San Francisco,California, this 9th day of March, 1921, and 8th day of October, 1919,respectively.

PAUL S. LUTTRELL. PAUL C'. ROSKE.

